This is a song about a strange love!
They both love each other but at the same time difficult for them to be together !!
They do not understand themselves!
They live in a mixture of love and suffering that is unbearable!
..........
She knows that it will never change!
So she wants to walk away from him.
And he (as I understand because he loves her) does not want to let that happen !!
..
Because her love is sincere! ...
She knows that even she leave him, her thoughts go away constantly be with him ...
because he makes it able to fly !!!!!!!